Automated Changelog Entry for 6.15.0 on main (#959)

Co-authored-by: GitHub Action <41898282+github-actions[bot]@users.noreply.github.com>

CHANGELOG.md

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+## 6.15.0
+
+([Full Changelog](https://github.com/ipython/ipykernel/compare/v6.14.0...5c1adcae929d8b4d28bf2b7849fe0e220c729b26))
+
+### Bugs fixed
+
+- Fix compatibility with tornado 6.2 beta [#956](https://github.com/ipython/ipykernel/pull/956) ([@minrk](https://github.com/minrk))
+
+### Maintenance and upkeep improvements
+
+- Back to top-level tornado IOLoop [#958](https://github.com/ipython/ipykernel/pull/958) ([@minrk](https://github.com/minrk))
+- Explicitly require pyzmq >= 17 [#957](https://github.com/ipython/ipykernel/pull/957) ([@minrk](https://github.com/minrk))
+- [pre-commit.ci] pre-commit autoupdate [#954](https://github.com/ipython/ipykernel/pull/954) ([@pre-commit-ci](https://github.com/pre-commit-ci))
+
+### Contributors to this release
+
+([GitHub contributors page for this release](https://github.com/ipython/ipykernel/graphs/contributors?from=2022-06-13&to=2022-06-15&type=c))
+
+[@minrk](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Aminrk+updated%3A2022-06-13..2022-06-15&type=Issues) | [@pre-commit-ci](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Apre-commit-ci+updated%3A2022-06-13..2022-06-15&type=Issues)
+
+<!-- <END NEW CHANGELOG ENTRY> -->
+
 ## 6.14.0
 
 ([Full Changelog](https://github.com/ipython/ipykernel/compare/v6.13.1...269569787419a47da562ed69fbe6363619f3b7e5))
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 [@blink1073](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Ablink1073+updated%3A2022-06-06..2022-06-13&type=Issues) | [@echarles](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Aecharles+updated%3A2022-06-06..2022-06-13&type=Issues) | [@nishikantparmariam](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Anishikantparmariam+updated%3A2022-06-06..2022-06-13&type=Issues) | [@pre-commit-ci](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Apre-commit-ci+updated%3A2022-06-06..2022-06-13&type=Issues)
 
-<!-- <END NEW CHANGELOG ENTRY> -->
-
 ## 6.13.1
 
 ([Full Changelog](https://github.com/ipython/ipykernel/compare/v6.13.0...82179ef8ae4e9bdcd99a4a4c3807e8f773f1e92c))